Electron Spin Resonance of an Irradiated Single Crystal of L-tyrosine-HCl

Analysis of the electron spin resonance (ESR) of a γ -irradiated single crystal of L-tyrosine-HCl reveals a free radical formed by loss of an H from the hydroxyl group attached to the ring. Principal g values of the radical are gx = 2.0023 ± 0.0005, gy = 2.0067 ± 0.0005, and gz = 2.0045 ± 0.0005, wi...

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Bibliographic Details
Published in:	Proceedings of the National Academy of Sciences - PNAS Vol. 62; no. 2; pp. 299 - 304
Main Authors:	Fasanella, Edwin L., Gordy, Walter
Format:	Journal Article
Language:	English
Published:	National Academy of Sciences of the United States of America 01-02-1969 National Acad Sciences
Subjects:	Atoms Crystals Electron paramagnetic resonance Free radicals Irradiation Magnetic fields Molecular theory Physical Sciences: Physics Physics Single crystals Tensors
Online Access:	Get full text
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Summary:	Analysis of the electron spin resonance (ESR) of a γ -irradiated single crystal of L-tyrosine-HCl reveals a free radical formed by loss of an H from the hydroxyl group attached to the ring. Principal g values of the radical are gx = 2.0023 ± 0.0005, gy = 2.0067 ± 0.0005, and gz = 2.0045 ± 0.0005, with gx perpendicular to the plane of the ring and gy along the CO bond to the ring. Analysis of the hyperfine structure of the spectra shows electron spin density on C(2) and C(6) to be 0.24 and on C(4) to be 0.32. Corresponding spin densities calculated from molecular orbital theory are 0.26 and 0.31, respectively.
Bibliography:	This study was supported by the U.S. Air Force Office of Scientific Research, grant AFAFOSR-66-0493 A, and by the U.S. Army Research Office (Durham), grant DA-ARO(D)-31-124-G1053.
ISSN:	0027-8424 1091-6490
DOI:	10.1073/pnas.62.2.299